What consumer is the most important in a food web and pyramid? (Question asks: Identify the important producers and consumers using scientific explanation and justification)

If you are given a clear liquid how can you determine if there was another subtance in the liquid

Which of the following measurements is expressed in three significant figures? A. 420 mL of hydrochloric acid B. 0.003 g of vitamin D C. 622.00 kg of sulfur D. 0.201 L of nitrogen gas

What is the layer of the sun through which energy is transferred away from the core by radiation?

Can lead replace iron?

How many moles of methane will react to form 3.2 moles of carbon dioxide?

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.

Research about the reaction of baking soda and vinegar

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.